Immune System
The role of the M cell is to

induce apoptosis in virus-infected small intestinal epithelia cells
they use their cilia to propel mucus out of the small intestine
trap virus in mucus and prevent entry
pass bacteria or virus to underlying macrophages for processing and presentation of antigen

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Immune System
Polymorphonuclear leukocytes (or PMNs)

All of these
are derived from bone marrow stem cells
are a type of phagocyte that can engulf and kill bacteria
can be attracted to the site of an infection following activation of complement

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